PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-20:12:30
G02     253.6764       76.2608         11.6180 +/-  0.7234   11.9241 +/-  0.7234  0.070 / 0.200
G05     171.6052       19.8480         14.5188 +/-  0.7502   32.0647 +/-  0.7502  0.070 / 0.180
G06     40.3384        51.4202         10.3089 +/-  0.4138   12.7810 +/-  0.4138  0.080 / 0.220
G12     321.1481       60.4532         10.1376 +/-  1.2925   11.4676 +/-  1.2925  0.060 / 0.190
G17     77.8492        16.1760         10.4835 +/-  1.1571   25.3385 +/-  1.1571  0.120 / 0.330
G19     65.3226        32.8362         10.1036 +/-  0.9204   16.7090 +/-  0.9204  0.090 / 0.270
G24     240.6285       31.4841         13.9343 +/-  1.4553   23.6710 +/-  1.4553  0.030 / 0.050
G25     317.6667       22.0274          8.9348 +/-  1.7015   18.7188 +/-  1.7015  0.030 / 0.060